Airbag warning after battery disconnect

I had to replace my battery over the weekend, stupidly let my niece and nephew play in my car and hadn't noticed they had left the interior light on.
Put the battery back and all is ok, well a lot of warning lights that will go away when driven, but I now have an airbag warning. This was not present before the battery died so I'm hoping it just needs reset.
What would I need to reset the light, I know a standard OBDII reader will not work?
Or any advice on who to take it to in Edinburgh?

The problem is now fixed - thought I would provide an update in case this happens to anybody else.

I bought a CANBus reader and was able to read the code but it would not let me clear it. I was just starting to panic when I thought the car was pretty sluggish to start. Even though the battery had said it took a full charge it must have been a bit faulty. I took it out again and measured the voltage - it was just under 12.5v.

I swapped it for a spare, started the car an the light was gone. I couldn't leave that battery in as it didn't have a lip around the bottom to secure it to the car so I bought another one. When filing this one, again the Airbag warning light was still gone.